build(editor): blog editor JS build and drift gate

- Private ESM package with exact pins: @tiptap/core, pm, starter-kit,
  extension-table and extension-image 3.31.4; vite 7.3.5, vitest 3.2.7,
  happy-dom 20.11.6 and typescript 5.9.3, the admin SPA toolchain
- vite.config.ts builds assets/src/blogeditor/index.ts into fixed-name
  assets/dist/blogeditor.js and blogeditor.css, minified, and runs vitest
  on happy-dom
- scripts/check-dist.sh rebuilds into a temp dir and fails when assets/dist
  is stale; node_modules is ignored

package.json

@@ -0,0 +1,26 @@
+{
+  "name": "golem15-journal-blogeditor",
+  "private": true,
+  "type": "module",
+  "engines": {
+    "node": ">=22.6"
+  },
+  "scripts": {
+    "typecheck": "tsc --noEmit",
+    "build": "tsc --noEmit && vite build",
+    "test": "vitest run"
+  },
+  "dependencies": {
+    "@tiptap/core": "3.31.4",
+    "@tiptap/extension-image": "3.31.4",
+    "@tiptap/extension-table": "3.31.4",
+    "@tiptap/pm": "3.31.4",
+    "@tiptap/starter-kit": "3.31.4"
+  },
+  "devDependencies": {
+    "happy-dom": "20.11.6",
+    "typescript": "5.9.3",
+    "vite": "7.3.5",
+    "vitest": "3.2.7"
+  }
+}